American



UNITED STATES PATENT OFFICE.

WILLIAM G. ALLEN, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE AMERICANSPECIALTY COMPANY, OF SAME PLACE. i

PUNCH OR HEADING DEVICE.

SPECIFICATION forming part of Letters Patent N 0. 578,437, dated March9, 1897.

Application led November 13 1896. Serial No. 611,983. (No model.)

.To @ZZ whom it may concern.-

Hartford, Connecticut, have invented new and useful Improvements inPunches or Heading Devices, which improvements are fully set forth inthe following specification.

This invention relates to the construction of a punch or heading devicesuch as used for upsetting the end of a wire, as in making rivets andsimilar articles. In such operations the Wire or blank is held in asocket, with the portion to be upset and spread projecting. Thisprojecting part is acted upon successively by two heading devicesl orpunches. The first has a socket or recess which engages the end of theblank to hold it true during the squeezing operation, whereby the blankis suiiiciently upset to press out a bulge or swell all around the blankbetween the two ends. A second punch or header completes the operationby flattening out the entire projecting part of the blank.

In forming rivets with relatively short shanks and large heads theprojecting part of the blank is of greater length than that which liesin the socket of the anvil or holder. Consequently when the firstheader, after acting upon the blank, is withdrawn it frequently carriesthe blank with it. In such case the operation must be arrested until theblank is disengaged by hand from the header and replaced in the socketof the anvil or holder.

The object of the present invention is to construct a heading devicewhich will automatically clear itself of the blank and which inoperation possesses other features of utility, as will be hereinafterpointed out.

In the form of punch or holder in which I have embodied my invention theheader has a chamber containing a plunger, the shank of which worksfreely in a hole extending vfrom the chamber to the face of the punch.

The head of the plunger lies in said chamber and is pressed forward by acomparatively stiff spiral spring. The chamber is closed at its end byan adjustable screw-plug, which forms a rigid bearing for the head ofthe plunger, the adjustment of the plug determining the amount of metalwhich the header will press out. The spring acts, when the header iswithdrawn, to throw the plunger forward,

thus discharging the blank and compelling it to remain in the anvil orholder.

In the accompanying drawings, illustrating my invention, Figures 1, 2,3, and 4t are sectional vi'ews representing, respectively, relativepositions of the holder and anvil at different stages of the operation.Fig. 5 is a similar view of the anvil or holder, showing the position ofthe core in discharging the partially-finished blank therefrom; and Fig.6 is a detail of the blank before it has been subjected to the operationof the mechanism herein described.

Referring tothe drawings, A represents a heading device having a chambero. therein, in which is located plunger b, shank b/ of which worksfreely in opening c, extending from chamber c to the face of the header.The head b2 of plunger b lies Within the chamber and is pressed forwardbya spiral spring` c. At its rear end chamber d is closed by ascrew-plug d, against which spring e presses. Said plug also forms arigid bearing for the head of the plunger upon the stroke of the headingdevice.

As already explained, the adjustment of the plug determines the amountof metal which will be pressed out. Upon the retreat of the header aftera forward stroke spring c acts to slide the plunger forward in openingo, thereby ejecting the blank from said opening and causing it to remainin the socket in the anvil or holder.

D is the anvil or holder, having a socket d therein, in which isarranged a core df', movable fo eject the partially-completed articleafter the action of the first heading device is completed. This anvilisof awell-known construction and need not be minutely described.

In operation a blank such as shown in Fig.

6 is placed in the socket d, Fig. 1, its greater portion projecting fromthe socket. Upon the advance of the heading device A, as shown in Fig.2, the projecting end of the blank enters the end of opening c, pushingplunger b rearwardly until it abuts against the plug d. The furtheradvance of the header (see Fig. 3) causes the blank to spread or bulgeout between its ends, as clearly shown in the drawings. Upon the retreatof the header (see Fig. 4) the spring e causes the plunger to slide ICOforwardly, the shank b thereof ejecting the blank from opening c andleaving it in the socket of the anvil or holder. It is ejected from thelatter by the forward movement of the core d", effected by any suitablemeans. (Not shown.)

Modifications in details of construction may be made without departingfrom the nature and principle of the invention.

The word rivet is here employed in a generic sense to embrace allarticles made from a wire blank in which a head is formed on one end ofthe blank by upsetting and spreading.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. A punch or header having a chamber, and a perforation extending fromthe face of the punch to said chamber, in combination with a plungercomprising a shank working in said perforation, and a head in saidchamber, a spring in the latter tending to throw the plunger forward,and means whereby the movement of said plunger may be adjusted,substantially as described.

2. In a heading device for making rivets. and similar articles, thecombination with the anvil or holder having a socket for receiving theblanlgof a punch comprising va casing having a chamber therein and aperforation extending from the face of the punch to said chamber, aplunger comprising a shank working in the perforation and a head in saidchamber, a spring in the latter surrounding said head and tending tothrow the plunger forward, and a plug closing the end of the chamber andforming a rigid bearing for the head of the plunger, substantially asde# scribed.

3. A punch or header having a chamber, and a perforation extending fromthe face of the punch to said chamber, in combination with a plungercomprising a shank working in said perforation, a head on the plungerworking in the chamber, a spring in the chamber tending to throw theplunger forward, and an adjustable plug or closure for the chamberforming a rigid bearing for the head of the plunger, substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftwo subscrib ing witnesses.

VILLIAM G. ALLEN.

Vitnesses:

CHAs. FLINT, JOHN G. HAWLEY.

